My model runs with HVAC comprised of VAV and reheat. However, if I switch to Ideal Air I get the following error: Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2014.12.30 01:21,IDD_Version 8.1.0.009 * Severe * IP: IDF line~9077 Object=CONTROLLER:MECHANICALVENTILATION, name=CONTROLLER MECHANICAL VENTILATION 1, Required Field=[Zone 1 Name] was blank. * Warning * IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details. * Severe * IP: Possible incorrect IDD File * ~~~ * IDD Version:"IDD_Version 8.1.0.009" How do I check to insure I have the correct IDD file? Thank you, Matt